Arnold, Dean E. <br/><br/>
Problem effects of acid precipitation on Pennsylvania waters / 
by Dean E. Arnold, Robert W. Light and Valerie J. Dymond 
 - Carvallis, Oregon :  U.S. Environmental Protection Agency,  1980 
 - vii, 21 p. :  fig. ;  27 cm. 
<br/><br/> EPA-600/3-80-012 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water--Pollution<br/>Sewage irrigation<br/>Water quality management
<br/><br/><label>Dewey Class. No.: </label>628.168